APL and J are on my list of programming languages I'd like to learn. I've been listening to the Array Cast podcast for a while. I just need a place to start. I

APL and J are on my list of programming languages I'd like to learn. I've been listening to the Array Cast podcast for a while. I just need a place to start. I don't really learn a language until I use it for something, at the moment I have nothing to use APL for. Any recommendations of where to start would be welcome.